<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告框 -->
      <el-alert
        title="添加商品信息"
        type="info"
        :closable="false"
        show-icon
        center
      >
      </el-alert>

      <!-- 进度条 --------------------------------------------------------------->
      <el-steps :active="stepActive - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品照片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!----------------------  总表单  ------------------------------->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!----------------------  总标签页面  ------------------------------->
        <el-tabs
          tab-position="left"
          v-model="stepActive"
          :before-leave="onBeforeLeave"
          @tab-click="tabClicked"
        >
          <!----------------------  基本信息  ------------------------------->
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                class="cate_select"
                :options="cateList"
                v-model="addForm.goods_cat"
                :props="cateProps"
                @change="onCascaderChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>

          <!----------------------  商品参数  ------------------------------->
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="v"
                  v-for="(v, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>

              <!-- <pre>{{item.attr_vals}}</pre> -->
            </el-form-item>
          </el-tab-pane>

          <!----------------------  商品属性  ------------------------------->
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
              <!-- <pre>{{item.attr_vals}}</pre> -->
            </el-form-item>
          </el-tab-pane>

          <!----------------------  商品照片  ------------------------------->
          <el-tab-pane label="商品照片" name="3">
            <el-upload
              :headers="headerObj"
              :action="uploadURL"
              :on-preview="onPreview"
              :on-remove="onRemove"
              :on-success="onSuccess"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>

          <!----------------------  商品内容  ------------------------------->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>

            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
        <!-- /总标签页 -->
      </el-form>
      <!-- /总表单 -->
    </el-card>
    <!-- /卡片视图区 -->

    <!----------------------  图片预览  ------------------------------->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previePath" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data () {
    return {
      stepActive: '0',
      // 表单数据绑定
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品详情
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 分类数据
      cateList: [],
      // 级联选择器
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数数据列表
      manyTableData: [],
      onlyTableData: [],
      // 上传图片路径
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的 headers 请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览URL
      previePath: '',
      // 图片预览 flag
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类列表失败！')
      }

      this.cateList = res.data
    },
    // 级联分类选择器
    onCascaderChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        this.$message.warning('请选择三级商品分类')
      }
    },
    // tabs
    onBeforeLeave (activeName, oldName) {
      if (oldName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请首先选择商品分类！')
        return false
      }
    },
    async tabClicked (tab) {
      if (this.addForm.goods_cat.length !== 3) {
        return
      }
      // 商品参数标签被点击
      if (tab.name === '1') {
        const id = this.addForm.goods_cat[2]
        const { data: res } = await this.$http.get(
          `categories/${id}/attributes`,
          {
            params: {
              sel: 'many'
            }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取分类参数信息失败！')
        }

        // 将 attr_vals 从字符串转为数组
        res.data.forEach((item) => {
          const valsStr = item.attr_vals.trim()
          item.attr_vals = valsStr.length > 0 ? valsStr.split(' ') : []
        })

        this.manyTableData = res.data
      }
      // 商品属性标签被点击
      if (tab.name === '2') {
        const id = this.addForm.goods_cat[2]
        const { data: res } = await this.$http.get(
          `categories/${id}/attributes`,
          {
            params: {
              sel: 'only'
            }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取分类参数信息失败！')
        }

        this.onlyTableData = res.data
      }
    },
    // 处理图片预览
    onPreview (file) {
      console.log(this.previePath) // DEBUG
      this.previePath = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片
    onRemove (file) {
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中， 找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex((x) => {
        x.pic = filePath
      })
      // 3. 调用数组的 splice 方法把图片信息对象从数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 图片上传成功回调函数
    onSuccess (resp) {
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: resp.data.tmp_path }
      // 2. 将图片信息对象， push 到 pics 数组中
      this.addForm.pics.push(picInfo)
    },
    add () {
      // 校验
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error('校验未通过。')
        }
        // this.$message.info("valide pass");
        // 执行添加的业务逻辑
        // loadash cloneDeep(obj) 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        // 清空一下
        this.addForm.attrs = []
        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })

        form.attrs = this.addForm.attrs

        console.log(form) // DEBUG

        // 发起请求，添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style scoped>
.cate_select {
  width: 350px;
}
.el-checkbox {
  margin: 0 10px 15px 0 !important;
}
.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
